The Inner Shell Influence on the Electronic Structure of Double‐Walled Carbon Nanotubes

A Review of Double-Walled and Triple-Walled Carbon Nanotube Synthesis and Applications

“…Moreover, the effectiveness of this mixing is directly related to the van der Waals forces mediating the interlayer interactions. In other words, for weak IL interactions, the tubes composing the multi-walled systems would behave independently of each other [30][31][32][33][34][35][36][37][38]54,55]. In fact, DWNTs can show up in four different flavors (inner tube@outer tube), as shown in Figure 3a, while TWNTs present eight different flavors (inner tube@middle tube@outer tube), as depicted in Figure 3b.…”

“…The magnitude of these IL interactions will change according to the chirality combinations between the pairs (n, m)@(n , m ) in a DWNT or among the set (n, m)@(n , m )@(n , m ) in a TWNT [30][31][32][33][34][35][36][37][38]. Namely, Saito et al predicted that the IL interactions would play different roles in the DWNT structure and showed that the stability of the double-walled structure does not strongly depend on the (n, m) pairs of the tubes constituting the DWNT, but the van der Waals-related barrier potential for the relative motion of the inner and outer tubes depends strongly on the (n, m) pairs [38].…”

“…It had been common sense that incommensurate systems would not present IL interactions capable of changing the electronic and vibrational properties of the individual SWNT constituting the multi-walled carbon nanotubes [30][31][32][33][34][35][36][37][38]54,55]. On the other hand, commensurate systems would present IL interactions strong enough to perturb the electronic and vibrational structures of the SWNTs constituting the multi-walled tubes [30][31][32][33][34][35][36][37][38]54,55]. However, as discussed below, incommensurate tubes may present Moiré patterns, and in these cases, the IL interactions cannot be neglected [54,55].…”

Electronic transport properties of inner and outer shells in near ohmic-contacted double-walled carbon nanotube transistors

“…5 Moreover, the interwall coupling between the two shells may modify the electronic structure of each shell. 10 For example, the presence of inner metallic shell can induce a large effective gap of outer semiconducting shell at low temperatures, or generate a finite density of states in the band gap of outer shell at high temperatures. 11 Most of investigations on DWCNT FETs focused on the role of DWCNTs themselves in the performance of DWCNT FETs.…”

Characteristics and Applications of Carbon Nanotubes with Different Numbers of Walls

“…There are only a few reports on experimental measurements for electrical transport in DWCNTs [31][32][33]. It was also confirmed by scanning tunnelling microscopy (STM) measurements that a DWCNT composed of two semiconducting walls can exhibit metallic properties overall [34]. It was also confirmed by scanning tunnelling microscopy (STM) measurements that a DWCNT composed of two semiconducting walls can exhibit metallic properties overall [34].…”